基于I/Q解调原理的数字PAD研制
Design of a digital PAD based on I/Q demodulation principle
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摘要: I/Q解调器可以同时测量微波信号的相位和幅度。为了消除传统I/Q解调器的不平衡误差，根据I/Q解调原理，应用数字滤波器及Hilbert变换等数字信号处理方法实现了对微波信号的正交解调，可以精确测量任意包络形状微波信号的相位和幅度。测试表明，数字相位和幅度探测器的精度可达±0.5°，重复性误差小于0.2°，温度系数约为-0.1°/℃，相位测量的动态范围为-18~5 dBm，幅度测量的动态范围为-20~0 dBm，其各项指标都达到了BEPCⅡ直线加速器相控系统的要求。Abstract: Conventional analog I/Q demodulator suffers from phase and amplitude imbalance and DC offset, which cause big error into the measurement. A digital PAD is designed. Based on I/Q demodulation principle, using digital algorithms, such as digital filter and Hilbert transform, the conventional measurement error can basically be removed. Measuremental results show that the digital PAD has a maximum phase error of ±0.5° and a resolution of 0.2°. Its temperature coefficient is -0.1°/℃. Its dynamic ranges for phase-measurement and amplitude-measurement are -18~5 dBm and -20~0 dBm, respectively. The digital PAD can meet the need of the BEPCⅡ phasing system.
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Key words:
- i/q demodulator /
- pad(phase-amplitude detector) /
- phasing system /
- linac /
- hilbert transform
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